How to prepare and Standardize 0.05 N Sodium hydroxide volumetric solution.
Preparation of 0.05 N Sodium hydroxide volumetric solution.
➤ Glass ware and instruments required.
Beaker, Glass stirrer, Graduated Pipettes, Graduated cylinder, Analytical balance, Sucker, Volumetric flask, Fume hood.
➤ Reagents required.
Sodium hydroxide.
Molecular wt NaOH , 40.0
Potassium hydrogen phthalate primary standard. (Previously dried for 2 hour at 120°C)
Phenolphthalein indicator.
➤ Glass ware and instruments required.
Beaker, Glass stirrer, Graduated Pipettes, Graduated cylinder, Analytical balance, Sucker, Volumetric flask, Fume hood.
➤ Reagents required.
Sodium hydroxide.
Molecular wt NaOH , 40.0
Potassium hydrogen phthalate primary standard. (Previously dried for 2 hour at 120°C)
Phenolphthalein indicator.
➤ Preparation.
Weigh 2 g sodium hydroxide pallets reagent grade in beaker
add 150 ml of carbon dioxide free water. Cool the temperature to room
temperature. Filter through filter paper and transfer to 1000 ml volumetric
flask dilute up to the mark with same solvent and transfer to tight polyolefin
container.
➤ Standardisation.
Accurately weigh about 0.25 g
potassium hydrogen phthalate PS,
previously crushed lightly and dried for 2 hour at 120°, in 250 ml
conical flask. Dissolve in 100 ml carbon dioxide free water. Add 2 drops of
phenolphthalein indicator solution. Titrate with 0.05 N / 0.05 M sodium
hydroxide till the solution becomes permanent pink. Note this final end point
as burette reading in ml.
➤ Calculations.
g KHC8H4O4 x 0.05
N / M =
--------------------------------------------------
0.01021 x
Burette reading in ml 
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